What Was the Unexpected Contribution of Keith Runcorn and His

Multiple Choice

What was the unexpected contribution of Keith Runcorn and his students to the continental drift controversy?

A) Apparent polar wander paths for rocks of various ages in Europe demonstrated that either the magnetic pole, or the continent's position, had wandered with time.
B) Magnetic stripes on the seafloor demonstrated magnetic reversals and seafloor spreading.
C) Reversed magnetic north directions preserved in rocks demonstrated that the location of Earth's axis had changed markedly throughout time, implying periodic cataclysms that shifted the continents during pole reversals.
D) Discordance of the Earth and Moon's magnetic pole orientations proved that the poles of one or both had drifted with the lithosphere since they were formed.